I use a strong mixture of garlic and water sprayed in and around the runs. I seen this on a tv show a few months back, and thought i would try it. I have not had a snake in the coup sense then. Get some garlic, mash it up in some water. Filter the mix into a spray bottle, then add more water once filtered. It is better if you let the mixture set overnight. Then spray in and around the coup.
The only problem is once it rains a good bit, you must reapply the spray.
The only problem is once it rains a good bit, you must reapply the spray.